package cuishifeng.blog.learn.collections.hash;

import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author cuishifeng <cuishifeng0207@163.com>
 * Created on 2021-04-23
 */
public class HashMapDemo {

    public static void main(String[] args) {

        HashMap hashMap = new HashMap();

        ConcurrentHashMap concurrentHashMap = new ConcurrentHashMap();
        concurrentHashMap.put("key", "123");
    }
}
